Safety and reliability can be said to be the biggest competitiveness of a car nowadays. Quality and reliability are guaranteed, the factory can mass production, customers can rest assured that the application. Not only the whole vehicle, but even a part of the car, needs to be strictly checked. Automotive switches and other automotive parts, in the operation of the temperature, humidity, and other harsh environment, causing the oxidation of the switch contacts, then it needs what tests? What other equipment do you need besides the thermal humidity chamber?
What are the switches on a car?
| 1. Headlight switch | 2. Windshield wiper switch |
| 3. Turn signal switch | 4. Hazard light switch |
| 5. Cruise control switch | 6. Power window switch |
| 7. Door lock switch | 8. Climate control switch |
| 9. Audio system switch | 10. Rearview mirror switch |
These are just a few examples of the switches commonly found in cars, but there may be additional switches depending on the specific make and model of the vehicle.
Why is it necessary to test car switches?
As cars become more and more highly automated, many functions converge in a variety of switches that can be operated with a series of complex operations at the touch of a finger. Switches are undoubtedly very important for automobiles. Some switches play an important role, and once they fail, driving safety will not be guaranteed. This test is meaningful both for the sake of ensuring driving safety and improving the driving experience.
General temperature and humidity test standard for automotive switches
Test conditions: temperature 23±5℃, relative humidity 45%~75%, air pressure 86~106kPa, test voltage accuracy should not be less than 0.5 level, ammeter accuracy not less than 1.0 level, withstand voltage test transformer capacity should not be less than 0.5kVA
Low-temperature test: 23±5℃→-40±3℃ (keep 2h in non-working condition)
High-temperature test: 23±5℃→the highest working environment temperature (keep 2h)
Temperature change test: The specimen is kept at -40±3℃ temperature for 2h to take out, then put into the high temperature environment corresponding to the standard specified value for 2h, and cycle 5 times.
Humidity and heat test:
①The test product is put into the environment with humidity of 45%~75% and temperature of 25±3℃ until the temperature of the test product is stable, then the relative humidity is increased to 95%~100% within 1h.
② 40±2℃ was lowered to 25±3℃ within -3~6h, and the relative humidity during this period was not lower than 95% except for the initial 15 min which was not lower than 90%.
③Keep the temperature at 25±3℃ and relative humidity not less than 95% for 24h cycle.
These are the common test standards and methods for switches used in automobiles, and each auto group will have different standards for their own brands so that they can have high quality and high quality products long ago. Take VW as an example and see what the differences are.
VW80101-2009 Volkswagen switch temperature and humidity test standard
Low temperature test: 23±5℃→-40±3℃, keep 24h
High temperature test: 23±5℃→70±3℃, keep 24h
Alternating temperature test:
Temperature: -40 ℃ -70 ℃ range in accordance with the speed of change, a cycle time: 8 hours, 30 times a cycle
TuB (low temperature limit working temperature) = -40℃ , ToB (high temperature limit working temperature) = 70℃
Damp heat test:
Temperature upper limit: +55℃, cycle times: 6 times
① 25 ± 3 ℃ → 55 ℃, to (3 ± 0.5) h to reach, the relative air humidity is not allowed to be less than 95%, the last 15min is not allowed to be less than 90%
②55℃→(25℃±3), to be reached by 3h to 16h drop.
Commonly used equipment
Thermal Humidity Chamber:
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Temperature Range:
A : -20℃ ～ +150 ℃
B : -40℃ ～ +150 ℃
C: -70℃ ～ +150 ℃
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Temperature Fluctuation: ± 0.5 ℃
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Temperature Deviation: 20% ~ 98% RH
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Humidity Deviation: ± 2.5% RH
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Cooling Rate: 1 ℃ / min
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Heating Rate: 3 ℃ / min
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Standard Configuration: 1 Cable hole (Φ 50), with plug; 2 shelves
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Heat load: 1000W
Fast change rate thermal cycle chamber:
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Temperature Range:
A : -20℃ ～ +150 ℃
B : -40℃ ～ +150 ℃
C: -70℃ ～ +150 ℃
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Temperature Fluctuation: ± 0.5 ℃
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Temperature Deviation: ± 2.0 ℃
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Cooling Rate: 5 ℃ / min
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Heating Rate: 5 ℃ / min
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Standard Configuration: 1 Cable hole (Φ 50), with plug; 2 shelves
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Heat load: 1000W
LIB is one of the largest environmental test equipment manufacturers in China, with a professional design and manufacturing team and rich overseas sales experience. At the same time, we also attach great importance to after-sales service with customers. If you are interested in thermal humidity chamber or other reliability test equipment, we will give you a satisfactory answer.
